The Solutions, Colloids and Suspensions Chemical Demonstration Kit helps students grasp that when it comes to mixtures, size matters. Students will learn how to easily identify a mixture as one of three types through various applications.
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The size of the particles will determines whether a mixture is a solution, colloid or a suspension. Through a series of four demonstrations, students will see and learn how to easily identify a mixture as one of these three types. Can the particles be collected in a filter? Will they pass through a semipermeable membrane? Do they scatter light? Students will witness these different properties and draw conclusions based on their observations. Teacher Demonstration Notes and reproducible student worksheets are included.
Concepts: Solution, colloid, semipermeable membrane, Tyndall effect.
Time Required: 20 minutes
Materials Provided: Ammonium hydroxide solution, copper(II) sulfate solution, colloidal starch solution, hydrochloric acid solution, iodine–iodide solution, sodium thiosulfate solution, dialysis tubing and clamps. Note: Perform this demonstration in a fume hood or well-ventilated lab.
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Planning and carrying out investigations
Analyzing and interpreting data
Constructing explanations and designing solutions
Disciplinary Core Ideas
MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
HS-PS2.B: Types of Interactions
Energy and matter
Scale, proportion, and quantity
Structure and function
MS-PS1-2: Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed.
MS-PS1-6: Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy by chemical processes.
MS-PS3-4: Plan an investigation to determine the relationships among the energy transferred, the type of matter, the mass, and the change in the average kinetic energy of the particles as measured by the temperature of the sample.
MS-PS3-5: Construct, use, and present arguments to support the claim that when the kinetic energy of an object changes, energy is transferred to or from the object.
HS-PS1-3: Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.
HS-PS1-5: Apply scientific principles and evidence to provide an explanation about the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs.